there is some Super functions to handle functions at runtime.
You can check a function exists with func.exists function:
if func.exists('some_func')
some_func()
endif
You can get list of all of functions with func.list function:
$funcs = func.list()
println($funcs)
output:
['a', 'b', '...']
The output is a list.
You can delete a function at runtime with func.delete function:
func.delete('some_func')